Heat exchanger for a gas turbine engine

A turbine engine, comprising:

• a compressor section, a combustion section, and a turbine section in a serial flow arrangement;
• and
• a heat exchanger comprising:
• a core having a unit cell defining a first primary channel, a second primary channel, a first secondary channel in flow communication with the first primary channel, and a second secondary channel in flow communication with the second primary channel, the first secondary channel traverses through the second primary channel and the second secondary channel traverses through the first primary channel, wherein the unit cell is one of a plurality of unit cells that form the core, the plurality of unit cells being coupled with each other in flow communication, each unit cell of the plurality of unit cells defining a first primary channel in flow communication with a first primary channel of an adjacent unit cell of the plurality of unit cells, a second primary channel in flow communication with a second primary channel of the adjacent unit cell of the plurality of unit cells, a first secondary channel in flow communication with the first primary channel and in flow communication with a first secondary channel of the adjacent unit cell, and a second secondary channel in flow communication with the second primary channel and in flow communication with a second secondary channel of the adjacent unit cell, the first secondary channel traverses through the second primary channel and the second secondary channel traverses through the first primary channel.

A turbine engine, comprising:

• a compressor section, a combustion section, and a turbine section in a serial flow arrangement;
• and
• a heat exchanger comprising:
• a core having a unit cell defining a first primary channel, a second primary channel, a first secondary channel in flow communication with the first primary channel, and a second secondary channel in flow communication with the second primary channel, the first secondary channel traverses through the second primary channel and the second secondary channel traverses through the first primary channel, wherein the unit cell of the core defines a first tertiary channel in flow communication with the first primary channel and the first secondary channel and defines a third tertiary channel in flow communication with the first primary channel and the first secondary channel, wherein the third tertiary channel traverses through the second primary channel, and the first tertiary channel is directly fluidly connected with the first primary channel.